The typical plerion-type is the Crab nebula.
It is the remnant of SN 1054, and is now one of the brightest celestial sources at most wavelengths.
Figure REF  shows the X-ray image of the Crab nebula taken by Chandra.
Jets extend out to northwest and southeast from the central source (the pulsar),
while two torii are seen emanating outward from the center.
The inner radius of the torus is 0.01–0.1 pc,
which corresponds the shock of the relativistic winds from the pulsar terminated by ambient material
[1]}, [2]}, [3]}.
For more details, please see the chapter of this work concerning PWNe.
